n. extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned

n. bottom-living cephalopod having a soft oval body with eight long tentacles

n. medium-sized greyish-black whale of the northern Pacific

Etymologies

devil +‎ fish (Wiktionary)

Examples

They had not intended to spend the afternoon, but found themselves too fascinated to turn away from the breakers bursting upon the rocks and from the many kinds of colorful sea life starfish, crabs, mussels, sea anemones, and, once, in a rock-pool, a small devilfish that chilled their blood when it cast the hooded net of its body around the small crabs they tossed to it.